101 lines
2.3 KiB
Rust
101 lines
2.3 KiB
Rust
//@aux-build:proc_macros.rs:proc-macro
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#![allow(clippy::unnecessary_fold, unused)]
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#![warn(clippy::manual_try_fold)]
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#![feature(try_trait_v2)]
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use std::ops::ControlFlow;
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use std::ops::FromResidual;
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use std::ops::Try;
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#[macro_use]
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extern crate proc_macros;
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// Test custom `Try` with more than 1 argument
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struct NotOption(i32, i32);
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impl<R> FromResidual<R> for NotOption {
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fn from_residual(_: R) -> Self {
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todo!()
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}
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}
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impl Try for NotOption {
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type Output = ();
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type Residual = ();
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fn from_output(_: Self::Output) -> Self {
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todo!()
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}
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fn branch(self) -> ControlFlow<Self::Residual, Self::Output> {
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todo!()
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}
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}
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// Test custom `Try` with only 1 argument
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#[derive(Default)]
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struct NotOptionButWorse(i32);
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impl<R> FromResidual<R> for NotOptionButWorse {
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fn from_residual(_: R) -> Self {
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todo!()
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}
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}
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impl Try for NotOptionButWorse {
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type Output = ();
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type Residual = ();
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fn from_output(_: Self::Output) -> Self {
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todo!()
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}
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fn branch(self) -> ControlFlow<Self::Residual, Self::Output> {
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todo!()
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}
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}
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fn main() {
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[1, 2, 3]
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.iter()
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.fold(Some(0i32), |sum, i| sum?.checked_add(*i))
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.unwrap();
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[1, 2, 3]
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.iter()
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.fold(NotOption(0i32, 0i32), |sum, i| NotOption(0i32, 0i32));
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[1, 2, 3]
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.iter()
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.fold(NotOptionButWorse(0i32), |sum, i| NotOptionButWorse(0i32));
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// Do not lint
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[1, 2, 3].iter().try_fold(0i32, |sum, i| sum.checked_add(*i)).unwrap();
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[1, 2, 3].iter().fold(0i32, |sum, i| sum + i);
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[1, 2, 3]
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.iter()
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.fold(NotOptionButWorse::default(), |sum, i| NotOptionButWorse::default());
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external! {
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[1, 2, 3].iter().fold(Some(0i32), |sum, i| sum?.checked_add(*i)).unwrap();
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[1, 2, 3].iter().try_fold(0i32, |sum, i| sum.checked_add(*i)).unwrap();
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}
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with_span! {
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span
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[1, 2, 3].iter().fold(Some(0i32), |sum, i| sum?.checked_add(*i)).unwrap();
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[1, 2, 3].iter().try_fold(0i32, |sum, i| sum.checked_add(*i)).unwrap();
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}
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}
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#[clippy::msrv = "1.26.0"]
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fn msrv_too_low() {
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[1, 2, 3]
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.iter()
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.fold(Some(0i32), |sum, i| sum?.checked_add(*i))
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.unwrap();
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}
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#[clippy::msrv = "1.27.0"]
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fn msrv_juust_right() {
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[1, 2, 3]
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.iter()
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.fold(Some(0i32), |sum, i| sum?.checked_add(*i))
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.unwrap();
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}
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